interj. 嗬(表示惊讶或引人注意)

[医] 钬(67号元素)

[ noun ]
a trivalent metallic element of the rare earth group; occurs together with yttrium; forms highly magnetic compounds
<noun.substance>

Hydroxyl \Hy*drox"yl\, n. [Hydro-, 2 + oxygen + -yl.] (Chem.)
A compound radical, or unsaturated group, {HO}, consisting of
one atom of hydrogen and one of oxygen. It is a
characteristic part of the hydrates, the alcohols, the oxygen
acids, etc.

Ho \Ho\, pron.
Who. [Obs.]

Note: In some Chaucer MSS.


Ho \Ho\, Hoa \Hoa\, n. [See {Ho}, interj., 2.]
A stop; a halt; a moderation of pace.

There is no ho with them. --Decker.


Ho \Ho\, prop. n. (Chem.)
The chemical symbol for Holmium.
[PJC]


Ho \Ho\, Hoa \Hoa\ (h[=o]), interj. [Cf. F. & G. ho.]
1. Halloo! attend! -- a call to excite attention, or to give
notice of approach. ``What noise there, ho?'' --Shak.
``Ho! who's within?'' --Shak.

2. [Perhaps corrupted fr. hold; but cf. F. hau stop! and E.
whoa.] Stop! stand still! hold! -- a word now used by
teamsters, but formerly to order the cessation of
anything. [Written also {whoa}, and, formerly, {hoo}.]

The duke . . . pulled out his sword and cried
``Hoo!'' --Chaucer.

An herald on a scaffold made an hoo. --Chaucer.